Bone growth in width
how is the shape of bone maintained as we grow
via bone growth and remodeling! growth in length happens via interstitial growth at epiphysis.. at same time remodeling via appositional growth will widen the bone, helping maintain the shape.
What is the process of bone growth in width called
appositional growth
how is the bone affected by appositional growth
bone diameter increases, cortical width increases, and medullary cavity size increased
step 4 of appositional growth
bone will grow outwards as osteblasts in periosteum build new circumferential lamellae which will close in on a vessel creating a new osteon. this process keeps repeating
step 3 of appositional growth
lamellae will form inwards via osteoblasts in endosteum and close the tunnel, forming the central canal and a new osteon
what cells are involved in appositional growth
periosteal osteogenic, osteoclast, and osteoblast cells. periosteal osteogenic cells that will differentiate into osteoblasts who build bone on outer surface. endosteal osteoclasts will digest inner bone in the endosteum increading the diameter of medullary cavity.
step 2 of appositional growth
periosteal ridges will fuse ariund the blood vessel, creating an endosteum lined tunnel
step 1 of appositional growth
ridges in the periosteum create grooves for the periosteal blood vessel